Error - django.db.migrations.exceptions.CircularDependencyError: accounts.0001_initial, songs.0001_initial
I have two apps accounts and songs. Songs have two model files - models.py and song_metadata_models.py
accounts/models.py
class AppUser(models.Model):
user = models.OneToOneField(User)
user_languages = models.ManyToManyField('songs.SongLang')
user_genres = models.ManyToManyField('songs.SongGenre')
def __str__(self):
return self.user.username
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
songs/song_metadata_models.py
class SongGenre(models.Model):
short_name = models.CharField(max_length=10)
full_name = models.CharField(max_length=100)
def __str__(self):
return self.full_name
class SongLang(models.Model):
short_name = models.CharField(max_length=10)
full_name = models.CharField(max_length=100)
def __str__(self):
return self.full_name
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
songs/models.py
class Song(models.Model):
# Fields
name = CharField(max_length=255)
slug = AutoSlugField(populate_from='name', blank=True)
created = DateTimeField(auto_now_add=True, editable=False)
last_updated = DateTimeField(auto_now=True, editable=False)
url = CharField(max_length=100)
artist = CharField(max_length=50)
album = CharField(max_length=50)
like = BooleanField(default=False)
dislike = BooleanField(default=False)
# Relationship Fields
requested_by = ForeignKey('accounts.AppUser', related_name='song_requested_by')
dedicated_to = ManyToManyField('accounts.AppUser', null = True, blank = True,related_name='song_dedicated_to')
recommended_to = ManyToManyField('accounts.AppUser', null = True, blank = True,related_name='song_recommended_to')
How to solve this? There is no circular dependency at models level then why this issue?
Solution 1: move the AppUser's many2many to SongLang and SongGenre. A m2m relationship is by default symetric so you can declare it on either side of the relationship (nb: just make sure to set the related_name to how your fields was named in the AppUser model).
Solution 2: move your SongGenre and SongLang models to a third app (the canonical solution to circular dependencies)
Solution 3: eventually try to first create the AppUser model without the m2m fields, creates the initial migration, then add the m2m fields (not sure it will work though).